Vacuum-tube manufacture



,461,227. F. Smm/ERIM VACUUM TUBE IfANUFACTUEE Fils@ 0st. 6. 1919 Patentes aan ie, icas.A

narratistares.

PAUL SCHWERIN. or new Yoan, n. Y., ,assienoiel To WESTERN ELECTRIC COMPANY,

I-EGORPORATEP, F NEW YORK, N. Y.; A CORPORATION OF NEW YORK.

VACUUM-TUBE MANUFACTURE.

Application led October 6, 1919. Serial No. 328,820.

To all whom 'it may concern:

Be it known that I, PAUL SCH-wartime,

citizen of` the United States, residingjat New York, in the county of Bronx and State of New York, have invented certain new and useful improvements in Vacuum- Tube Manufactum, of' whichthe following is a full, clear, conci, and exact description. A

manufacture, and more particularly-it relates to ainachine for rounding the ends of glass arbors used in Vacuum tubes.

In the manufacture of vacuum tubes, it is frequently desirable Vto employ an electrode supporting structure which consists ofa glass. vrod or arbor of suitable length to which the supporting wires for the electrodes may be attached. Heretofore it has been customary to direct by hand a flame on "the ends of the arbors to round ed their ends before inserting the supporting wires for the electrodes. This invention comprises a machine for accomplishing the same result, whereby a plurality of the arbors may be worked on simultaneously., Y

The machine of this invention comprises a plurality ot rotatable shafts to the. ends of which the glass rods may be attached. Flames are provided, for heating the ends oi the glass rods in order to round oii' the ends as desired.

ribis invention will be better understood by reference to the following detailed description taken in connection with the accompanying 'drawing in which Fig. l represents the machine oi this invention, and Fig. 2 is a cross-sectional view of a portion of the same. Referring to the drawing. members 5 and 6 constitute a frame work Jfor supportingl a lurality of rotatable shafts 7, 8 and 9. ach shaft is provided with a pulley l0, connected by a ,belt l1` to a pulley 12, which is driven by a suitable source of power not shown. Mounted on the cud ot each shaft v' is a hollow casing 13 within which suitable spring means 1+i are provided for holding the glass rod 15', so that the axis of the 'glass rod coincides with the axis of the shaft.

Flames 16, 17 and iS are provided for heating the ends of the glassrods, while the glass This'invention relates toyaeuum tube of da plurality of rods lmay berounded oi simultaneously. l

I t is obvious that as many rotatable shafts as desired may bemounted on the frame work 5 and 6 andthat other modifications,

. inventionas defined by the appended claims-.l

What is claimed is: 1. A machine for rounding` off the ends of glass rods comprising a vplurality of rotat-A able shafts, tubular member carried by said 'shaftsmeans for attaching a glass rod to an end of each of said shafts whereby the direction of the axis ofsaidrod coincides with the axis/of said shaft, said means comprising a leaf spring having a return bend portion, the end-s of said spring being adapted to resiliently grip said rod, means' for heating the ends of said rods and means for simultaneously rotating said shafts.

2. A machine for shaping the end 'of a.

glass rod comprising a rotatable shaft, a".

tubular member mounted onsaid shaft coaxial therewith, a spring in said tubular' member symmetrically disposed with .respect to the axis of said shaft and adapted to re siliently grip a glass rod, and means for heating the end of said rod.

3. A machine for shaping the end of a glass rod comprising a rotatable shaft, a. tubular member mounted on said shaft coaxial therewith. a leaf spring having al re turn bend portion. said spring being arranged in said tubular member with the4 bow portion thereof fribtionally engaging the inner wall of the tubular member, the ends of said spring being adapted to resiliently grip a glass rod and means yfor heating said rod. y y' 4. A'machine for shaping the end of a glass rod comprising a rotatable shaft, a protecting tubular member carried by said shaft and surrounding the major portion of said glass rod for shielding.: said major pon. tion from the direct application of heat,

means for holding said rod in a position to allow only a small portion of'said rod t0 project beyond said ,tubular member, and

mean-s for heating the end of said rod beyond said tubular member.

5. A. machine for4 shaping the end of a glass rod comprising a rotatable shame protecting tubuIar member carried by said vsliaffh and ISurrol'mding' 'lzhe major pdrtio-n 'of said glass 'rod for shielding said major means located entirely Within said tubular.

5 member for holdingsaid'rod in a'positoh to -allow only a, small portion ofsaid rodto projet beyond said tubularvmembeg'gmd my name th 191,9.

-means lforheating.th end of said-'rod ben yond said tubular member; 'portion from the du'ect apphcauQn-'of heat; -v

In Witness where'of, Lhereunto subcribe 10 is 30th dayof September, ATD.;

AUL SCHWERIN' 

